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Behaviour Tree

Warhammer 40,000: Space Marine 2 AI uses the Behaviour Tree technology. All behaviour trees are executed on the server side.

Each tree node returns a result: it is either success or failure.

  • Selector executes branches from left to right until one succeeds.
  • Sequence executes branches from left to right until one fails.
  • Active selector works like a Selector, but branches to the left of the currently active branch can request execution. For example: got enemy > stop patrolling and engage this enemy.

Behaviour trees use blackboards — the sets of variables to works with. These variables are:

  • Parameters, such as cooldown length, fighting range, etc.
  • Values passed from external sources, such as an enemy.

Nodes obtain the information from providers. For example, the Shoot Target node has the Target field of the Object type. In the tree, this field is set to Object Provider: Current Enemy, which provides the node with information about which target to shoot.

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